Journal
OPTICS EXPRESS
Volume 24, Issue 2, Pages 874-882Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.000874
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Funding
- National Natural Science Foundation of China (NSFC) [61138003, 61427819, 61422506, 61405121]
- National Key Basic Research Program of China (973) [2015CB352004]
- Science and Technology Innovation Commission of Shenzhen [KQCS2015032416183980, KQCS201532416183981, JCYJ20140418091413543]
- start-up funding at Shenzhen University
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It is well known that radially polarized beam could produce an ultra-long longitudinally polarized focus, referred to as optical needle. In this work, we reveal that the counterpart transversely polarized optical needle (similar to 5.83.) with exceptionally suppressed sidelobes (9.9% of the maximum of the principal lobe) can be generated by tightly focusing a hybridly polarized beam through a multibelt binary phase filter. A universal analytical model is built up for investigating the depth, uniformity and polarization properties of the needle. We find that there is a trade-off between needle length and intensity uniformity, and the main lobe keeps almost transverse polarization at each observation plane. Such a nondiffraction transversely polarized optical needle has potential applications in ultrahigh density magnetic storage as well as atomic trap and switches. (C) 2016 Optical Society of America
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